Try working as a cashier for 4 years, about 50 or so people would come in every couple weeks, and would do one of two things; 1) By a shit ton of chips, cart full of pop (literally), and banquets or 2) by $2-$5 worth of junk food, get $100 cash back and then come back in an hour later and purchase a couple 30 pks, and a 1/5 or two...with the same demoniation of $100 that you handed them an hour prior